he studied hard in his youth ,____contributed to his great success

问题描述:

he studied hard in his youth ,____contributed to his great success
in later life .
a.that b.it c.what d.which 为什么选d?

这里选择D是因为这里是一个非限制性定语从句,这里which指代前面的在年轻的时候努力学习这个事情
翻译:他年轻的时候学习刻苦努力,这就导致了他后来生活上的巨大成就!